Anion Effect on the Excited-State Intramolecular Proton Transfer of 4′-N,N-Diethylamino-3-hydroxyflavone in Ionic Liquids
Shohnosuke Nomura,
Kaori Fujii,
Hiroaki Sugihara
et al.
Abstract:The excited-state intramolecular proton transfer (ESIPT) reaction of 4′-N,N,-diethylamino-3-hydroxyflavone (C 2 HF) was studied using time-resolved fluorescence measurements in ionic liquids (ILs) of various anions with a fixed cation (1-ethyl-3-methylimidazolium [C 2 mim] + ). C 2 HF showed an ESIPT reaction from the normal excited state (N*; keto form) to the tautomer excited state (T*; enol form) where both states are emissive. The ESIPT rate and yield were obtained by analyzing the time-resolved fluorescen… Show more
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